The MacBook Pro (M1 Max, 14-inch, 2021) comes with a firmware identifier MacBookPro18,4. It has a Board Configuration of J314cAP and a Board Platform of t6001. The CPID and BDID are 24577 and 8 respectively.
IPSWDL.COM is a website that provides download links for IPSW files, which are used to install or restore firmware on Apple devices. These files are sourced directly from Apple's servers.